Process for producing toner particles using free space formed in a polymeric medium
AssigneeCanon Kabushiki Kaisha
InventorsShinya Mayama, Takeshi Ikeda, Yoshinobu Baba, Naoya Ogata
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Abstract
A toner for developing electrostatic images is comprised of toner particles having a number average particle diameter of from 0.5 .mu.m to 5.0 .mu.m, in which toner particles with a particle diameter of 6.0 .mu.m or larger is included in a proportion of not more than 5% by number. The toner particles are obtained by a process having the steps of dispersing a monomer composition containing at least a colorant, a charge control agent, or a mixture of these, and a polymerizable monomer, in free space formed in a polymeric medium, and polymerizing the monomer composition dispersed in said free space.
Claims7
A process for producing toner particles, comprising the steps of:
- dispersing a monomer composition containing at least a colorant, a charge control agent, or a mixture thereof, and a polymerizable monomer, in free space formed in a polymeric medium comprising a polymer having a weight average molecular weight from 3,000 to 150,000 dissolved in a solvent;
- polymerizing the monomer composition dispersed in said free space to obtain toner particles;
- and
- removing said toner particles from said polymeric medium,
- wherein the toner particles have a number average particle diameter from 0.5 .mu.m to 5.0 .mu.m, and contain particles with a diameter of 6.0 .mu.m or larger in a proportion of not more than 5% by number.
Dependencies are inferred from the claim text.